
//获取字符数组 
String.prototype.toCharArray = function()
{
	return this.split("");
}
// 获取N个相同的字符串
String.prototype.repeat = function(num)
{
	var tmpArr = [];
	for( var i = 0;i < num;i++)
		tmpArr.push(this);
	return tmpArr.join("");
}
// 逆序
String.prototype.reverse = function()
{
	return this.split("").reverse().join("");
}
// 测试是否是数字
String.prototype.isNumeric = function()
{
	var tmpFloat = parseFloat(this);
	if(isNaN(tmpFloat))
		return false;
	var tmpLen = this.length - tmpFloat.toString().length;
	return tmpFloat + "0".Repeat(tmpLen) == this;
}
// 测试是否是整数
String.prototype.isInt = function()
{
	if(this == "NaN")
		return false;
	return this == parseInt(this).toString();
}
// 合并多个空白为一个空白
String.prototype.resetBlank = function()
{
	return this.replace(/s+/g," ");
}
// 除去左边空白
String.prototype.LTrim = function()
{
	return this.replace(/^s+/g,"");
}
// 除去右边空白
String.prototype.RTrim = function()
{
	return this.replace(/s+$/g,"");
}
// 除去两边空白
String.prototype.trim = function()
{
	return this.replace(/(^s+)|(s+$)/g,"");
}
// 保留数字
String.prototype.getNum = function()
{
	return this.replace(/[^d]/g,"");
}
// 保留字母
String.prototype.getEn = function()
{
	return this.replace(/[^A-Za-z]/g,"");
}
// 保留中文
String.prototype.getCn = function()
{
	return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g,"");
}
// 得到字节长度
String.prototype.getRealLength = function()
{
	return this.replace(/[^x00-xff]/g,"--").length;
}
// 从左截取指定长度的字串
String.prototype.left = function(n)
{
	return this.slice(0,n);
}
// 从右截取指定长度的字串
String.prototype.right = function(n)
{
	return this.slice(this.length - n);
}
// HTML编码
String.prototype.HTMLEncode = function()
{
	var re = this;
	var q1 = [/x26/g,/x3C/g,/x3E/g,/x20/g
	];
	var q2 = ["&","<",">"," "
	];
	for( var i = 0;i < q1.length;i++)
		re = re.replace(q1[i],q2[i]);
	return re;
}
// Unicode转化
String.prototype.ascW = function()
{
	var strText = "";
	for( var i = 0;i < this.length;i++)
		strText += "&#" + this.charCodeAt(i) + ";";
	return strText;
}

String.prototype.startsWith = function(prefix)
{
	var i = this.indexOf(prefix);
	if(i == 0)
	{
		return true;
	}
	return false;
}